Device and method for preparing iron ore ultrafine powder through high-pressure water unloading

Abstract

The invention provides a device and a method for preparing iron ore ultrafine powder by utilizing laterite-nickel ore tailings. The device comprises a gas bin, a material bin and a collecting bin, a feeding hole of the stock bin is communicated with a gas outlet of the gas bin through a flexible gas pipeline; an air inlet of the air bin is connected with an air compressor through an air conveying pipeline, wherein the air compressor is used for providing compressed air for the air bin. A first piston is embedded in the inner side, located below the feeding port, of the stock bin in a matched mode, and a mass block used for sealing the stock bin is embedded in the position of a discharging port of the stock bin in a matched mode. A rapid unloading mechanism is arranged below the mass block in a matched mode and is supported by the mass block. A chamber, located between the first piston and the mass block, of the stock bin is an ore storage cavity, and a water inlet is formed in one side of the ore storage cavity in a matched mode. The water inlet is connected with a water pump for supplying water to the ore storage cavity through a high-pressure pipeline; the input end of the water pump is connected with the water storage bin. The method has the outstanding advantages of being good in crushing effect, simple in technological process, low in cost and the like.

Description

Technical Field

[0001] The invention relates to the technical field of iron ore ultrafine powder preparation and ore dressing, and in particular to a device and method for preparing iron ore ultrafine powder by high-pressure water unloading. Background Art

[0002] Lithium nickel cobalt manganese oxide is a key ternary cathode material for lithium-ion batteries, with higher specific capacity and lower cost than single cathode materials. Lithium nickel cobalt manganese oxide replaces more than two-thirds of the cobalt in lithium cobalt oxide with relatively cheap nickel and manganese, and has obvious cost advantages, making lithium nickel cobalt manganese oxide a new battery material and gradually replacing lithium cobalt oxide.

[0003] The world's nickel resources are mainly divided into nickel sulfide ore and laterite nickel ore. With the depletion of high-grade nickel sulfide ore, the efficient development and utilization of laterite nickel ore is particularly important. The iron content (36-50%) in the leaching residue of laterite nickel ore is difficult to realize resource utilization. At present, the main treatment method is still stockpiling or deep-sea landfill, which is easy to cause resource waste and environmental pollution. If the leaching residue containing high iron can be used as an iron resource, it is expected to increase the comprehensive utilization value of laterite nickel ore.

[0004] The current process requires the tailings to be ground very finely (<10μm) to completely dissociate and separate the iron-containing minerals, but the cost is too high. Summary of the invention

[0005] In view of the technical problems existing in the above-mentioned background technology, the present invention proposes a device and method for preparing ultrafine iron ore powder using laterite nickel ore tailings. The device and method have a reasonable design and can obtain ultrafine powder of laterite nickel ore tailings through rapid mechanical unloading. The device has the outstanding advantages of good crushing effect, simple process flow and low cost, and has strong technical and economic advantages over the existing grinding methods.

[0006] In order to solve the above technical problems, the present invention provides a device for preparing ultrafine iron ore powder using laterite nickel ore tailings, which comprises a gas bin, a silo matched with one side of the gas bin, and a collecting bin matched with the discharge port of the silo and used to collect the ultrafine iron ore powder sprayed from the silo;

[0007] The feed inlet of the silo and the gas outlet of the gas silo are connected through a flexible gas pipeline;

[0008] The air inlet of the air silo is connected to an air compressor for providing compressed air to the air silo through an air pipeline;

[0009] The silo is equipped with a first piston on the inner side below the feed port, and a mass block for sealing the silo is equipped with a mass block at the discharge port; the side wall of the first piston is in sealing contact with the inner wall of the silo; a quick unloading mechanism is matched and supported by the mass block below;

[0010] The chamber of the silo located between the first piston and the mass block is an ore storage chamber, and a water inlet is matched and arranged on one side of the ore storage chamber; the water inlet is connected to a water pump for supplying water to the ore storage chamber through a high-pressure pipeline; the input end of the water pump is connected to a water storage bin.

[0011] The device for preparing ultrafine iron ore powder using laterite nickel ore tailings, wherein: the rapid unloading mechanism is located inside the collecting bin and is composed of a bulk block, a support plate, a second piston and a high-pressure oil cylinder;

[0012] The discrete blocks are evenly distributed on the lower end surface of the mass block, and are used to support the mass block;

[0013] The second piston and the high-pressure oil cylinder are matched and located below the bulk block, and a specific groove for containing the bulk block is provided on the second piston; the bulk block is connected to the second piston via a support plate;

[0014] A solenoid valve is provided at the oil discharge port of the high-pressure oil cylinder.

[0015] The device for preparing ultrafine iron ore powder by utilizing laterite nickel ore tailings, wherein: a gas pressure gauge for observing gas injection pressure is also provided on one side of the gas bin.

[0016] The device for preparing ultrafine iron ore powder by utilizing laterite nickel ore tailings, wherein: a high-pressure gas needle valve is also matched and arranged on the gas pipeline between the gas inlet and the air compressor.

[0017] The device for preparing ultrafine iron ore powder by using laterite nickel ore tailings, wherein: the side surface of the mass block and the inner wall of the discharge port of the silo are sealed by a sealing ring.

[0018] The device for preparing ultrafine iron ore powder by using laterite nickel ore tailings, wherein: a high-pressure liquid needle valve for controlling opening or closing is also matched and arranged on the high-pressure pipeline between the water inlet and the water pump.

[0019] The device for preparing ultrafine iron ore powder by using laterite nickel ore tailings, wherein: a water pressure gauge for observing water injection pressure is also matched and arranged on one side of the ore storage chamber.

[0020] The device for preparing ultrafine iron ore powder by using laterite nickel ore tailings, wherein: the inlet of the collecting bin and the discharge port of the bin are fixedly connected by matching flanges.

[0021] A method for preparing ultrafine iron ore powder by using laterite nickel ore tailings is based on the device for preparing ultrafine iron ore powder by using laterite nickel ore tailings; the method specifically comprises the following steps:

[0022] 1) Install the mass block under the silo first;

[0023] 2) Reset the quick unloading mechanism and inject oil into the high-pressure oil cylinder, thereby pushing the second piston up, and the second piston pushes the bulk block, and the bulk block supports the mass block;

[0024] 3) adding laterite nickel tailings into the silo, the first piston in the silo is put into place, and the silo and the gas silo are connected through a flexible gas pipeline;

[0025] 4) Use a water pump to inject water into the silo to reach the preset pressure, and use an air compressor to inject air into the gas silo to reach the preset pressure;

[0026] 5) Open the solenoid valve on one side of the high-pressure oil cylinder, and the oil in the high-pressure oil cylinder is discharged through the oil discharge port;

[0027] 6) The second piston descends, and the bulk block follows the support plate and then opens;

[0028] 7) The mass block falls due to the loss of support from the bulk block, and the laterite nickel ore tailings and water are ejected and fall into the collection bin;

[0029] 8) drying and sieving the laterite nickel ore tailings and water in the collection bin to obtain laterite nickel ore tailings fine powder.

[0030] By adopting the above technical solution, the present invention has the following beneficial effects:

[0031] The device for preparing ultrafine iron ore powder from laterite nickel ore tailings of the present invention has a reasonable and compact structure design, and ultrafine powder of laterite nickel ore tailings is obtained by rapid mechanical unloading, and has outstanding advantages such as good crushing effect, simple process flow, and low cost; compared with the existing grinding method, it has strong technical and economic advantages.

[0032] The method for preparing ultrafine iron ore powder by utilizing laterite nickel ore tailings of the present invention is reasonable in conception and simple in process, and has the outstanding advantages of good crushing effect, simple process flow, low cost and the like; in particular, high-pressure gas is filled into the gas bin by an air compressor, and high-pressure water is filled into the silo by a water pump, and after the rapid unloading mechanism located at the lower end of the silo is started, the laterite nickel ore tailings and the high-pressure water that have been saturated with high-pressure water are rapidly ejected under the condition of being pushed by the high-pressure gas, so that the laterite nickel ore tailings can collide with the collecting bin, and the tailings can achieve a better crushing effect under the dual effects of the high-pressure water gradient and the strong impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 The present invention is a schematic structural diagram of a device for preparing ultrafine iron ore powder using laterite nickel ore tailings;

[0035] Figure 2 It is a schematic structural diagram of the first piston of the device for preparing ultrafine iron ore powder by using laterite nickel ore tailings of the present invention;

[0036] Figure 3 This is a comparison diagram of the experimental effects of the device for preparing ultrafine iron ore powder using laterite nickel ore tailings of the present invention;

[0037] Figure 4 This is a comparison diagram of the original laterite nickel ore tailings and the processed ore powder of the device for preparing ultrafine iron ore powder using laterite nickel ore tailings of the present invention. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The present invention is further explained below in conjunction with specific implementation modes.

[0040] like Figure 1 As shown, the present embodiment provides a device for preparing ultrafine iron ore powder using laterite nickel ore tailings, comprising an air bin 1, a material bin 2, a collection bin 3, a water storage bin 4, an air compressor 5, a quick unloading mechanism 6 and a water pump 7.

[0041] The upper part of the gas bin 1 is matched with an air inlet 11, and the lower part is matched with an air outlet 12; wherein, the air inlet 11 is matched and connected with the output end of the air compressor 5 on one side of the gas bin 1 through a gas pipeline, so as to be used to introduce compressed air into the gas bin 1 through the air compressor 5; the lower end side of the gas bin 1 is also matched with a gas pressure gauge 13 for observing the gas injection pressure; at the same time, the gas pipeline between the air inlet 11 and the air compressor 5 is matched with a high-pressure gas needle valve 14 for controlling the opening or closing of the gas pipeline.

[0042] The silo 2 is matched and arranged below the gas silo 1, and is provided with a feed port 21 at the top and a discharge port 22 at the bottom; wherein the feed port 21 of the silo 2 is connected with the gas outlet 12 of the gas silo 1 through a flexible gas pipeline 9 (the inner diameter of the flexible gas pipeline 9 is 35 mm), so as to provide the high-pressure gas in the gas silo 1 to the silo 2, and at the same time, laterite nickel tailings are loaded through the feed port 21; the silo 2 forms an ore storage cavity along the feed port 21 from the discharge port 22. The silo 2 is matched and embedded with a first piston 23 inside the silo 2 below the feed port 21; Figure 2 As shown, the upper and lower side walls of the first piston 23 are matched with guide grooves 231 along the circumferential direction, and the middle side wall is matched with an annular groove along the circumferential direction and a sealing ring 232 is matched and embedded in the annular groove; the first piston 23 is sealed and connected with the inner side wall of the silo 2 through the sealing ring 232; the lower inner side of the silo 2 is matched with a step, and the first piston 23 stops at the step position after pushing the material out at high speed, sealing the high-pressure gas above. After the loading is completed, the first piston 23 is put into place; the gas silo 1 and the silo 2 are separated by the movable first piston 23; the discharge port 22 of the silo 2 is matched and embedded with a mass block 8, and the mass block 8 is first put into place before loading; the quick unloading mechanism 6 is matched and supported by the mass block 8, and the discharge port 22 of the silo 2 is sealed by the mass block 8, and the side of the mass block 8 and the inner wall of the discharge port 22 of the silo 2 are sealed by the sealing ring. A water inlet 24 is matched on one side of the middle section of the silo 2, and the water inlet 24 is matched and connected to the output end of the water pump 7 on one side of the silo 2 through a high-pressure pipeline, and a high-pressure liquid needle valve 25 for controlling opening or closing is also matched on the high-pressure pipeline; the input end of the water pump 7 is matched and connected to the water storage silo 4 through a water delivery pipeline; a water pressure gauge 26 for observing the water injection pressure is also matched on one side of the lower end of the silo 2. In this embodiment, the silo is 1m long and has an inner diameter of 100mm.

[0043] The collecting bin 3 is matched and arranged below the discharge port 22 of the silo 2 and is used to collect the ejected ultrafine iron ore powder; in this embodiment, the collecting bin 3 is square, and the side panels on the left and right sides thereof can be opened.

[0044] The quick unloading mechanism 6 consists of a bulk block 61, a support plate 62, a second piston 63 and a high-pressure oil cylinder 64; wherein the bulk blocks 62 are evenly distributed on the lower end surface of the mass block 8 and located inside the collecting bin 3, and are used to support the mass block 8; the second piston 63 and the high-pressure oil cylinder 64 are matched and arranged below the bulk block 62 and located inside the collecting bin 3; a specific groove for holding the bulk block 61 is provided on the second piston 63; the bulk block 61 is connected to the second piston 63 with the specific groove through the support plate 62; a solenoid valve is provided on the pipeline at the oil unloading port on one side of the high-pressure oil cylinder 64, and the solenoid valve is electrically connected to an external electric control system; the electric control system is mainly used to open the solenoid valve, and the solenoid valve is mainly used to unload the oil in the high-pressure oil cylinder, the top cover of the second piston 63 descends, the support plate 62 descends, the bulk block 61 descends, and the mass block 8 falls, completing the unloading action.

[0045] When it is necessary to start the quick unloading mechanism 6, the solenoid valve is opened by control, the oil in the high-pressure oil cylinder 64 is discharged through the hose connected to its oil unloading hole, the second piston 63 descends, and the bulk block 61 opens after following the support plate 62 to descend; at the same time, after the quick unloading mechanism 6 is started, the mass block 8 moves downward rapidly under the push of the high-pressure gas in the gas bin 1 due to the loss of support of the bulk block 12, and the laterite nickel ore tailings and water in the silo 2 are ejected and fall into the collecting bin 3 under the push of the high-pressure gas in the gas bin 1, and the side panels on the left and right sides of the collecting bin 3 are openable, which is convenient for the collection of ultrafine iron ore powder.

[0046] The inlet end of the collecting bin 3 and the discharge port 22 of the silo 2 are connected by a flange; after the silo 2 is inserted into the collecting bin 3, the flange fixes the silo 2 and seals the gap between the discharge port 22 of the silo 2 and the inlet of the collecting bin 3 to prevent dust from being sprayed out.

[0047] The laterite nickel ore tailings are loaded into the silo 2 through the feed port 21, high-pressure water is injected into the silo 2, and high-pressure gas is injected into the gas silo 1. The internal pressure of the gas silo 1 after the gas is injected is 20MPa, and the internal pressure of the silo 2 after the water is injected is 40Mpa; after starting the rapid unloading mechanism 6, the pressure of the gas silo 1 pushes the laterite nickel ore tailings to be ejected quickly, and finally, the ore powder and the mass block 8 are all sprayed into the collecting bin 3.

[0048] In this embodiment, the first piston 23 is sealed with the silo 2 through the guide groove 231 and the sealing ring 232, and has the following functions: ① separating the gas silo 1 and the silo 2. When the ore in the silo 2 is pushed out, the first piston 23 is reset so that the gas in the gas silo 1 can be reused; ② the first piston 23 can realize the overall surface propulsion of the ore; ③ the first piston 23 is hollow, which can not only increase the speed, but also reduce the impact force on the steps in the silo 2; specifically, after the first piston 23 pushes the material out, it will stop at the step position on the inner side of the silo 2. The first piston 23 will not go out of the silo 2, and the high-pressure gas above the first piston 23 will be sealed. In the next experiment, the first piston 23 will be reset to compress the high-pressure gas to achieve the recycling of the high-pressure gas.

[0049] In another embodiment, the inner diameter of the silo 2 is 100 mm, and a total of 3 kg of laterite nickel tailings can be placed at one time. It should be noted that the size of the silo 2 is not fixed, and those skilled in the art can design silos 2 of different volumes according to actual conditions to better adapt to actual use requirements.

[0050] In this embodiment, after the experiment is completed, the mass block 8 is installed in place, and water is injected into the silo 2 through the water inlet 24 to push the first piston 23 to return to the initial state of the experiment.

[0051] The pressure of the gas bin 1 in this embodiment can be maintained at 20 MPa, and the pressure in the gas bin 1 is maintained by injecting compressed air into the gas bin 1 through the air compressor 5.

[0052] Figure 3 The device for preparing ultrafine iron ore powder from laterite nickel tailings of the present invention is used to carry out two groups of experimental data on the cumulative particle size distribution of laterite nickel ore obtained at different gas injection pressures, wherein the black square is the cumulative particle size distribution of the raw material, and its D50 is 13.7μm; the blue triangle is the cumulative particle size distribution curve obtained when the pressure of gas chamber 1 is 20MPa, and its D50 is 7.1μm; the red circle is the cumulative particle size distribution curve obtained when the pressure of gas chamber 1 is 15MPa, and its D50 is 8.5μm. It can be clearly seen that as the pressure of gas chamber 1 increases from 15MPa to 20MPa, D50 decreases from 13.7μm of the original ore to 8.5μm and 7.1μm respectively.

[0053] Figure 4 (a) is the raw ore of laterite nickel ore, Figure 4 (b) is the ore powder after processing of laterite nickel ore.

[0054] The method for preparing ultrafine iron ore powder by using laterite nickel ore tailings of the present invention is based on the above-mentioned device for preparing ultrafine iron ore powder by using laterite nickel ore tailings, and specifically comprises the following steps:

[0055] S100, installing a mass block 8 below the silo 2;

[0056] S200, the quick unloading mechanism 6 is reset, and oil is injected into the high-pressure oil cylinder 64, thereby pushing the second piston 63 upward, and the second piston 63 pushes the loose body block 62, and the loose body block 62 supports the mass block 8;

[0057] S300, adding laterite nickel tailings into the silo 2, the first piston 23 on the upper part of the silo 2 is put into place, and the silo 2 and the gas silo 1 are connected through the flexible gas pipeline 9;

[0058] S400, inject water into the silo 2 through the water pump 7 to reach a preset pressure, and inject air into the gas silo 1 through the air compressor 5 to reach a preset pressure;

[0059] S500, the solenoid valve on the side of the high-pressure oil cylinder 64 is opened through the electronic control system, and the oil in the high-pressure oil cylinder 64 is discharged through the oil discharge hole;

[0060] S600, the second piston 63 descends, and the bulk block 62 follows the support plate 62 and then opens;

[0061] S700, the mass block 8 falls due to the loss of support from the bulk block 62, and the laterite nickel ore tailings and water are ejected and fall into the collection bin 3;

[0062] S800, drying and sieving the laterite nickel ore tailings and water in the collecting bin 3 to obtain fine powder of the laterite nickel ore tailings.

[0063] The invention has a reasonable conception, and obtains ultrafine powder of laterite nickel ore tailings through rapid mechanical unloading, and has outstanding advantages such as good crushing effect, simple process flow, and low cost; compared with the existing grinding method, it has strong technical and economic advantages.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for preparing ultrafine iron ore powder using laterite nickel ore tailings, characterized in that: The device comprises a gas bin (1), a material bin (2) matched with the gas bin (1) and a collection bin (3) matched with the material bin (2) below the discharge port (22) and used for collecting the ultrafine iron ore powder ejected from the material bin (2); The feed inlet (21) of the material bin (2) and the gas outlet (12) of the gas bin (1) are connected via a flexible gas pipeline (9); The air inlet (11) of the air bin (1) is connected to an air compressor (5) for providing compressed air to the air bin (1) via an air pipeline; The silo (2) is matched with a first piston (23) mounted on the inner side below the feed port (21), and a mass block (8) for sealing the silo (2) is matched with a mass block (8) mounted at the discharge port (22); the side wall of the first piston (23) is in sealing contact with the inner wall of the silo (2); a quick unloading mechanism (6) is matched with the mass block (8) and supported by the same; The chamber of the silo (2) located between the first piston (23) and the mass block (8) is an ore storage chamber, and a water inlet (24) is provided on one side of the ore storage chamber; the water inlet (24) is connected to a water pump (7) for supplying water to the ore storage chamber through a high-pressure pipeline; the input end of the water pump (7) is connected to the water storage bin (4).

2. The device for preparing ultrafine iron ore powder using laterite nickel ore tailings as claimed in claim 1, characterized in that: The quick unloading mechanism (6) is located inside the collecting bin (3) and is composed of a bulk block (61), a support plate (62), a second piston (63) and a high-pressure oil cylinder (64); The scattered blocks (62) are evenly distributed on the lower end surface of the mass block (8) and are used to support the mass block (8); The second piston (63) and the high-pressure oil cylinder (64) are matched and located below the bulk block (62); the second piston (63) is provided with a specific groove for accommodating the bulk block (61); the bulk block (62) is connected to the second piston (63) via a support plate (62); A solenoid valve is provided at the oil discharge port of the high-pressure oil cylinder (64).

3. The device for preparing ultrafine iron ore powder using laterite nickel ore tailings as claimed in claim 1, characterized in that: A gas pressure gauge (13) for observing gas injection pressure is also matched and arranged on one side of the gas bin (1).

4. The device for preparing ultrafine iron ore powder using laterite nickel ore tailings as claimed in claim 1, characterized in that: A high-pressure gas needle valve (14) is also matched and arranged on the gas transmission pipeline between the gas inlet (11) and the air compressor (5).

5. The device for preparing ultrafine iron ore powder using laterite nickel ore tailings as claimed in claim 1, characterized in that: A seal is achieved between the side surface of the mass block (8) and the inner wall of the discharge port (22) of the silo (2) via a sealing ring.

6. The device for preparing ultrafine iron ore powder using laterite nickel ore tailings as claimed in claim 1, characterized in that: A high-pressure liquid needle valve (25) for controlling opening or closing is also matched and arranged on the high-pressure pipeline between the water inlet (24) and the water pump (7).

7. The device for preparing ultrafine iron ore powder using laterite nickel ore tailings as claimed in claim 1, characterized in that: A water pressure gauge (26) for observing water injection pressure is also matched and arranged on one side of the ore storage chamber.

8. The device for preparing ultrafine iron ore powder using laterite nickel ore tailings as claimed in claim 1, characterized in that: The inlet of the collecting bin (3) and the discharge port (22) of the bin (2) are fixedly connected via a matching flange.

9. A method for preparing ultrafine iron ore powder by using laterite nickel ore tailings, based on the device for preparing ultrafine iron ore powder by using laterite nickel ore tailings as claimed in any one of claims 1 to 8; characterized in that: The specific steps include: 1) First, install a mass block (8) below the silo (2); 2) The quick unloading mechanism (6) is reset, and oil is injected into the high-pressure oil cylinder (64), thereby pushing the second piston (63) upward, and the second piston (63) pushes the bulk block (62), and the bulk block (62) supports the mass block (8); 3) adding laterite nickel tailings into the silo (2), the first piston (23) in the silo (2) is put into place, and the silo (2) and the gas silo (1) are connected via a flexible gas pipeline (9); 4) injecting water into the silo (2) to reach a preset pressure through a water pump (7), and injecting air into the gas silo (1) to reach a preset pressure through an air compressor (5); 5) Open the solenoid valve on one side of the high-pressure oil cylinder (64), and the oil in the high-pressure oil cylinder (64) is discharged through the oil discharge port; 6) The second piston (63) descends, and the bulk block (62) follows the support plate (62) and then opens; 7) The mass block (8) falls due to the loss of support from the bulk block (62), and the laterite nickel ore tailings and water are ejected and fall into the collection bin (3); 8) Drying and sieving the laterite nickel ore tailings and water in the collecting bin (3) to obtain laterite nickel ore tailings fine powder.

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